Machine for grinding the inner surfaces of cylinders or the like



K. JUNG Oct. 9, 1934.

MACHINE FOR GRINDING THE INNER SURFACES OF CYLINDERS 0R THE LIKE Filed Aug. 27. 1952 2 Sheets-Sheet l mvENTnm:

K, JUNG 1,975,899 MACHINE FOR @BINDING THE `INNER SURFACES OF CYLINDERS 0B THE LIKE 2 Sheets-Sheet 2 Filed Aug. 27. 1932 INVENTR! 30 against a iatentecl Oct. 9, 1934 1,975,899" e FOR GRINI'JING;l THE INNER SUR-1 FACES OF CYLINDERS OR THE LIKE Jug, Berlin, Germany Application August 27, 1932 Serial No. 630,713 In Germany November 21, 1931 s Claim. (C1. 51-105)' This invention relates to machines for grinding the inner surfaces of cylinders or the like and has for its object to provide an improved vconstruction thereof. In order to obtain greater precision in machines of this type, it has been proposed hitherto to adjust the toolby swinging its spindle on a swingingarm the axis of which is parallel to the axis of the piece to be worked. In the already known arrangements the swinging axis is also used for moving the grinding disc forward in the direction of its rotating axisand the swinging movement serves for the whole feeding or adjustment, i. e. for the coarse and iine adjustment; the result of Vthis is'uneven wear and 15 inaccurate work.

The present invention overcomes this difficulty in that the swinging movement is used only for the adjustment and that the coarse adjustment is effected by feeding the tool holder on a sliding guide perpendicularly to the axis of the piece to be worked, while the iine adjustment is eifected by swinging the swing arm by means of va cam which has the desired eccentricity.

The tool assumes a different height at its end .25 position according to the angle through which it is moved for the purpose of adjustment. In order to avoid this, according to the present invention the device is so arranged that at the end of the feeding movement the swing comes to rest stop which is so adjusted that in this position the axes of the grinding spindle and of the spindle for the piece to be worked lie in a horizontal plane perpendicular to theV rotation axis of the support for the piece to be worked, there ,35 being no play whatever in the rods by which the swing is moved.

The grinding spindle is mounted on a swing arm which is supported by an eccentric pivot located opposite its corresponding chuck which runs in adjustable roller bearings. This allows for the adjustment of the height of the line of Ycontactof the grinding disc and for the play .free guiding of the swing.

In order that the invention may be more vclearly understood, one particular construction thereof will now be described, by way of example, with vreference to the accompanying-drawings where- Figure 1 is a side view of the grinding machine,

Figure 2 is a part sectional front view,

Figure 2a is a side view of the bolt 16 in `Figure 2, and

Figure 3 is part sectional view of a portion of 55 Figure 1 drawn on a larger scale, and

`bearings by a clamp screw 22.

Figure 4 is a diagrammatic view of the means g for driving thedisengaging rod.

In these drawings 1 is the bed plate of the machine on which is arranged the spindle box 2 which supports the piece to be worked. The o spindle for the piece to be worked which is arif ranged in bearings in the spindle box, has at its front end a clamping chuck 3 into which is clamped a cylinder block 4 the inner side of which is to be ground'. The spindle box is arranged in the usual way on the bed plate 1; it can be displaced longitudinally of the bed plate by means of a slide 44 in order to ensure the forward move'- ment required durng'the operation of the machine, and can also be swung about a vertical axis 70 45 for the purpose'of adjusting thel spindle axis at an angle to the axis of the piece to be worked when it is'desired to grind cone-shaped surfaces. As `the means for adjusting the spindle box are already known they are not shown in the drawings. e

The grinding tool 5 is arranged on the spindle 6 which vis held-in position by its bearing 7. The bearing '1 together with the spindle and the pulley 8 by which the spindle is driven, form a complete unit which can be dismounted and exchanged. The grinding spindle is driven from a motor'9 by a pulley lOYand a belt 14 which passes over guide pulleys 11, 12 and 13 to the pulley 8 of the spindle. The spindle 6 together with its 85 bearing '7 is mounted in a swing 15 which is supported by a pivot 16. The latter is arranged von a slide 17 arranged on the machine frame `and is mounted in two bearings y18 `and 19. These are preferably roller bearings and are essentially taper bearings, so that the position can bearranged with utmost precision. The swing 15 is .clamped on to the bolt 16 by means of two'adjusting screws 20. The bearing pins 21 of vthe bolt 16 are, .as shown in `Figure 2a, arranged 95 eccentrically in relation t0 the axis of thevbolt 1.6, so that by. rotating the pins 21 .around their axis, the axis of the boltv 16 can be displaced .in a circle and, therefore, the swing can be adjusted in Vthis way. The bearing casing 7 ycarrying the 100 grinding spindle is rmly clamped in its split A screw 23 is provided vasa stop for the swing, which is held against the said stop 23 by the action of .a spring The shaft 52 'on .which the pulley' 1.1 is ar i .ranged carries a worm 51 :engaging la worm wheel 59. This worm wheel is mountedon al shaft 54 in such a manner that the shaft may be axially shifted with respectV to the wheel but is coupled therewith by means of a key 53 so that the rotation of the worm wheel 59 is transferred to the said shaft. On the same shaft 59 is fastened a gear 50 which in the position shown in Figure 1 meshes with a gear mounted on a vertical shaft. The lower end of the shaft 54 bears against the one end of a lever 55 pivotally journalled in the machine frame about the pivot 56. The other end of the lever 53 bears against the upper end of a rod 36. A spring 57 arranged between a fixed point of the frame and the right hand end of the lever 55 is intended to rotate the lever in an anticlockwise direction. However, it is prohibited from rotating in consequence of its abutment with the rod 36. Another spring 60, arranged between the frame and the upper end of the shaft 53, holds the shaft and the gear 50 in engagement with the gear 25. The means for vertically guiding the shaft 54 and the means for holdingy the worm wheel 59 on its place when the said shaft 54 is vertically shifted are not shown in the drawings. The gear 25, by means of a pair of bevel gears 26, drives or is driven by a horizontal shaft 27 (Fig. 3), on which is arranged a and this causes the shaft 32 to rotate in a clockwise direction. By means of the crank arm 33 and the link 34, the swing is caused to'move accordingly, so that, it will swing out to the right in Figure 3 and thus be adjusted in relation to A the piece to be worked. On the arm 31 there is also arranged a disengaging rod 36, which is carried with the arm 31 as it drops from the highest part of the cam disc 30, and the gear which drives the gear wheel 25 is thereby disengaged. If the rod 36 drops from the highest part of the cam disk 30, the lever 55 is allowed to be rotated in an anticlockwiseV direction by means of the spring 57. Thereby the shaft 54 with the gear 50 is raised so that the gear 50 comes out of engagement with the gear 25. The

50" gear 25 is reengaged by rotating the hand wheel 28 whereby the cam wheel 30 is further rotated by means of the bevel gear 26, and the arm 31 and the disengaging rod 36 are again lifted.

As the distance by which the grinding disc is moved forward is comparatively small, the cam disc 30 is so shaped that the rst part rises comparatively steeply and serves for moving the grinding disc against the piece to be worked and for adjusting the contact, and serves also for lifting the disengaging rod 36, While the last part f the cam disc has a comparatively slight slope for the purpose of adjusting the thickness of the shaving.

The adjustment screw 37 serves for adjusting the motor 9 for the purpose of tightening the adjustment of the grinding spindle 6, an aoljustable stop 42 is provided against which a cam 43 arranged on the swing abuts when the latter is in its end position. Thus the axis of the grinding spindle in this position will always be at the same height, namely at the height of the axis of the piece to be worked. It is preferable to arrange this in such a way that the swing which supports the tool hangs perpendicularly at the end of the working stroke. This makes it possible, after adjusting the support 2 of the piece to be worked by pivoting it on its perpendicular axis into the desired angular position, to grind a perfect hollow cone, which can be ground accurately only if the plane in which the tool moves forward contains both the axis of the tool and the rotating axis of the piece to be worked. If, as is usual in the grinding of a hollow cone, the plane of rotation of the piece tobev Worked is horizontal, -thennn the final position the axis of the piece to be Worked and the axis of theY tool must lie in the same horizontal plane. Accordingly the movement of the slide 17 is so arranged that it takes place in a plane perpendicular to the rotating axis of the spindle box 2, and also in the direction of the swinging movement of the tool axis 6. The machine therefore operates as follows:

After the piece to be worked has been clamped in position its support is moved by means of the longitudinal slide 44 to Within reach of the tool. The ktool is then brought near the inner surface of the piece to be worked by a transverse movement of the tool slide 17, effected by means of the hand-wheel 38. After that, the swinging movement of the grinding spindle can be executed according to the desired forward movement of the grinding spindle in proportion to the amount of abrasion. A

The hand wheel 28 is then rotated so that 115 the cam 30 is operated by means of the bevel gear 26 to such an extent, that the arm 31 which is lifted by it, will lift the rod 36 into the engaging position. After this the device will operate automatically. The cam wheel 30 completes its revolution and in doing so moves the swing 15 with the spindle 6, which has been previously moved close to the piece to be worked by hand wheel 28, closer to the piece to be worked n for the purpose of removing the filings. '-125 After the operation has been completed the lever 31 will drop from the highest part of the cam 30 and the machine is stopped by the downward movement of the disengaging rod 36. At the same time the swing 15 will be moved 51,30 back by the action of the spring 24 and lie against the stop 23.

The cam 30 is so arranged that at the end of the operation the swing is pressed against the stop 42 so as to ensure a definite end position.

If it is desired to grind a hollow cone then the spindle box 2 and the axis of the piece to be worked are rotated by an amount corresponding to the angle of the cone. In consequence 'Pille of the previously described arrangement of the bearings and the adjustment of the spindle 6 an accurate cone can then be ground.

I claim:

1.v A machine for grinding the inner surface of cylinders and the like, comprising a bed plate; means on the bed plate for holding and rotating the work piece to be ground; a slide mountedon the bed plate; a swinging arm mounted on the slide; a spindle provided on the swinging arm and having a grinding tool thereon; means for adjusting the slide transversely of the spindle on the bed plate to adjust the grinding tool for coarse feeding; and means for adjusting the swinging arm for adjusting the grinding tool for iine feeding.

2. A machine according to claim 1, in which the swinging arm is mounted on a pivot eccentrically arranged relative to the swinging axle of the swinging varm and thev pivot is mounted in adjustable roller bearings so that the height of the line of contact of the grinding surface can be adjusted.

3. A machine according to claim 1, in which a stop is provided against which the swinging arm abuts at the end of the forward feed movement, the stop being so arranged that in this position the aXes of the spindle and the work piece are in a plane' perpendicular' to a shaft about which a clamp of the work piece may be turned if a conical grinding is desired.

4. A machine according to claim 1, in which drive means are provided to effect the swinging movement of the arm and in which a cani is provided cooperating with the drive which at the same time disengages the drive at the end of the forward feeding movement.

5. A machine according to claim 1, in which drive means are provided to effect the swinging movement of the arm and in which a cam and a rod mounted on a lever of the carn are provided, wherehy the rod disengages the ldrive when the cam lever falls from the highest point of the cam.

KARL JUNG. 

